Preserve ES:DI instead of probing for $PnPsyslinux-3.53-pre5

The $PnP probe has been found to lock up at least one machine for
reasons unknown.  Drop it; instead, burn the extra few bytes in the
bootsector to save away ES:DI for later restore.

1 files changed, 6 insertions, 0 deletions

diff --git a/com32/include/syslinux/config.h b/com32/include/syslinux/config.h
index d0cb4c26..8b2ed4c9 100644
--- a/com32/include/syslinux/config.h
+++ b/com32/include/syslinux/config.h
@@ -68,6 +68,7 @@ union syslinux_derivative_info {
     uint16_t ax;
     uint16_t cx;
     uint16_t dx;
+    uint16_t _pad;
     const void *esbx;
     const void *fssi;
     const void *gsdi;
@@ -79,13 +80,16 @@ union syslinux_derivative_info {
     uint8_t ch;
     uint8_t drive_number;
     uint8_t dh;
+    uint16_t _pad;
     const void *ptab_ptr;
+    const uint32_t *esdi_ptr;
   } disk;			/* syslinux/extlinux */
   struct {
     uint8_t filesystem;
     uint8_t ah;
     uint16_t cx;
     uint16_t apiver;
+    uint16_t _pad;
     const void *pxenvptr;
     const void *stack;
   } pxe;			/* pxelinux */
@@ -96,7 +100,9 @@ union syslinux_derivative_info {
     uint8_t ch;
     uint8_t drive_number;
     uint8_t dh;
+    uint16_t _pad;
     const void *spec_packet;
+    const uint32_t *esdi_ptr;
   } iso;			/* isolinux */
 };